Telephonic repeater



5 Sheets-'Sheet 1 E. T. GILLILANDt TELEPHONIG REPEATEBH No. 247,631. Patented Sept. 27,1881.

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5 Sheets-Sheet 2 E. T. GILLILAN'D TELEPHONIGIREPEATBR.

No. 247,631. Patented Sept. 27,1881.

WITNESSES. INVENTOR m @Liw. W

5 Sheets-Sheet 3.

E. T. GILLILAND. TELEPHONIO REPEATER.

N0.Z47,63l. Patented Sept. 27,1881.

WITNESSES. I i J n m/VEA/roie. /amw 45 a p EZRA 'rL, enlilni mn, 0'1" 'ix'bm-sAroLis; 11 mm, ASSIGNOR 0F TWO-THIRDS growILLiAM It; MonnIs'oN', "IliLIABf 1o, 'BUUKXYOQDLAND CHARLES 1;,

'-.. RQQKWQOD, on satin PLACE. i,

sP IFIqMIp forming part of Letters pate t I a Amilii-nliunmelt-i To allwhum it may concern;

the city of Indianapolis, eonntyofMarion, and State'of .lntlianmhavv invented certain nitw' and useful iniprovements in Reprodncers of Untlnlat'ory Electric Waves peaters, [01 which the following is aspecitieation, reference being .had to the ing' drawings, which are made a; and on which similar eate similar parts.

aceom pan'y part hereof,'

Figure 1' is fa plan water all the instrul. ments, and parts which are employed in m'y inv .ntion at therepeating stzltioln ,Fig. 2 is-a side 4 ele\;ation ot' the same devices shown in v 1- g. 1. Fig. 3-is a longitudinal \eol't-iealfsection of the n ith my invention 'on' thedotted line a r in Fjgd. Fig.4 is a longitudinal vertical sect on of the repeater y 3 in Fig. I. fFig. 5 is an end. to same instrument of which Fig; 4zis a. sec; on. Fig. b is aplan of the'variou's wires commonly used in connection with this inven .tton, and is similar in some respects to Fig. 2,

but in nhich (as illustrating the proper running of the lines of wire is the only object) many of the details of the instrument mechanism are lacking, and allot the supporting frame-work, or, as far as possible, all non-electrical matters.- Fig. 7 i.\- plan of a telephone- .line too long tobe successfully operated'in asingle circuit, similariu detail to Fig. 6;

In all the drawings in which the various linesol' wire are wholly'or partly represented local are distinguished from main lines by being-drawn hemjer endless evenly. I

The object of my reproi'luce the electric wares ori mpulses caused by the voice or v phonic transmitter when the distance which can be safely operated in a single circuit has been reached in another circuit, in order that they may travel a still'tfarther distaneefsaid invention bearing" substantially the same relation to telephony that the electric repeater no? in use does to ordinarytelegraphy. To accomplish this object it is neees ry to combine in a single instrnnwnt, which l (l0;

or Telenhone te letters 'ot, Ieterenecin Elielectric switch usetl-iil'eonnection indieateequivalent parts, the

proper on the dotted. line elevation of invention is to repeator other sounds spoken into a, t ele a 63 111: dated September 27, 1881.

nominate a telphonie-repeater, an electro- 5b magnet having yable-or vibratingarma- 'tnre'and a inicroplmn'eor carbon orother transmitten I a i i In tbe'fd- "ings theyarions portions are designated etters'ofr erence i n'the f( )llo\v-. 5 5

x ;'As,in'order to.{-give aclear idea of the na- -ture andjworkings'of this invention. itisnec essary' todeal with tnio el'eetrieatcirenits, in i ea'chlof. which is a set of instrinnents sub- 6o stantially identi'cal w-itlt that in'the other, one cireltitiscalled,foreonvenieneesake theUhi-. cage {-or first eire-uit,and the other-tlief Cineinnati or second? circuit. in bOilLtllQStoireujtsand'the espectiveselsotinstrmnents 65- the same letters d tfreferenee are employed to f only ditterenee" bei'n g that in the Chicago ei run it: capital letters "are used andin the Cincinnati circuit small let ters. v v

In vthose cases wherethesamei'part bears the sanie relationto both circuits the last. few capital "letters of the 'alpl-l abet; V,"\\', X, Y, and Zytire'hmployed. Lettersliaying figuresat tach'cdare nsetl to"designates-ubdi'risions'ot' 7.5 parts, the, ivlroleot which the l'ctftifllondtas ig'nates'. v Telephones 42nd 'a(she\ ,aresnppose'dto be 'loc'ateda tent-from each oti oallowjot'snecessfnlcom iiqf nmnieet-ion'ythroug the medinm of a single 5 electrical cireni ljs' bef'oreKst venience'in'r t *nrgtbfhSQ 1 designated man o; and

speeti'telyi'a' repeating "nst Y same i o l ulia mpohs, Butt are Joe ted nea rfthe 'tele phon" lg'eysli an'dtb ar-cjso arranged excl the 13 telephone or the bats '9 tery-wit he mamlinc'of wtre"Her mat-j e-" pleasitre ol'theoperatof; '1; li'rst connections made by these main lines t -tlie central st; tion are toithe electromlg nets Diand (I, located near to and gppn'foppositekidesbt' the-Sn ite'ln95 Z,' i1l Sneh a'posit'ion as'log-iwhen properlyopy eluted upon, (trawl toward hemselves the our responding armature-s Dnnd (1", thus throwing said switch, to which said armatures is at tached, toward the side beiugused, which puts the points Z and D ore and d in con-tact, completing the properone of thelocal circuitsH and h, andinterrnptin g the other. Said electro-mag- 'netsare rer 'leredoperative in this connection by the electric current which is sent over the mainline, of wire from the battery Cor 0, when connection is made therewith by the proper switch key, re-enforced by the permanent mag,

nets I or t, which also serves asa mounting for the electro-magnets.

, The switch'Zis pivoted atitslowerendin the manner shown, and is so adjusted that its own weight will-cause it ,toren'aain in contact with oneof the points, D or at, until drawn to the other bythe-oppositemagnet in the sameman-l i nor in which it was drawn to the first-,-

The object of the switch, as above indicated, is to cut oft the repeater of the receiving-cm cuit from the main line of the transmittiu g-circuit, so that the electric waves produced by the repeater shall not be sent-back onto the This may be done either by interrupting the "local circuit, as before specified, or by shuntmain line of the transmitting-circuit, and thus interfere with the original electric waves which are being sent over that circuitto the repeater.

ing'or cutting out the electro-tnagnet'of the repeaterot' the receivingcircnit.

Supposing that the operator in Chicago desires to communicate direct with Cincinnati,

he will first, by means-of the switch-key B, throw his main line E in connection with the battery C, and thus render the electro-magnetD on his own side of the switch atIndianapolis operative, which will then, through the armature D, draw the switch Z over until the points Z and D are incontact, and'the local circuit, in connection with the repeater of his circuit, is

complete. He will their disconnect the battery and connect the telephone A with the main 'line E.v This beingdone, speaking intosaid telephone A will cause the ordinary telephonic or'undnlatory electric-waves to travel along saldmain line E of the Chicago circuit to In- I 'dianapolis, by which timejt will be assumed D is made so that the switch may beeperated in the manner specified, and-has no other significance. Were some other meansused to operate the switch,this connection would not be made at al l. The connection with the inductron-coil. f is made so that this circuit can be made to receive as well as-transmit. If it were only desired to send" messages {to Cincinnati this conuect-ionwould also be unnecessary and useless; but that to the ,electronagnet G or the repeater G is, as-willjnowhtj here fully explained, the means whcrebyIt-he message is repeated: and the electricwvaw'es reproduced in the receiving or Cincinna'ti'circuit, The electric current, iupassingth rough the electrounagnet C of the repeater-G, causes a' noveni'ent (the magnetism which vis supcrinduced bysaid electric current being the force) corresponding to the undulations of said current in the vibrate" ing armature'G, which, in turn, causes corres spending movements in the s ring-mounted ,platin'a point (3i and the spring-mounted carbon button G, thus also causing acorresponding disturbance of the electric current which is continually flowing from the battery X through the local line H W, and which passes through the primary coil of the induction- As is well known to those versed in the science of electricity, a disturbance of the current flowing through the primary coil of an inductiou-coil produces a current in the secondary coilcorrespondin g to such disturbance, and as the main line e of the Cincinnati circuit is connected to the secondary coil of the inductioncoil F, electric waves corresponding to those of the Chicago circuit, but of greatly-increased force, are sent over it, and,reachin g and acting upon the telephone a at Cincinnati, are reconverted' into sound-waves, and thus the voice of theoperator in Chicago is heard in Cincinnati, the same as though the distance were so short that an ordinary line composed of a single circuit could be employed. The switch arrangement whichhus already been described coufiues the reproduced waves to the Cincinnati. or receivin g circuit. I Reversing the switch and talking into the telephone a at the Cincinnati end of the line will constitute the Cincinnati circuit the transmitting-circuit, and the Chicago circuit the receiving-circuit,'as each circuit is the counters part in all thin gsof theother when'correspondingelectrical connections-arc made. i j-- It will be understood, of course, that-when theframe supporting the points D dis constructed as shown in'- the drawings, one of said. points'must be insulated. This is doue in the present instance by the insulator V. (Shown best in Fig. 3.) v

Thespriugs which support the platinapoi nt's G3 g are insulated from the surrounding parts:

by the insulators J.

All'parts ot this invention i fornied'ot' dis tinctively insulating material are shown in the drawings in solid black. i The line of wire Y is a ground-line common to-both of the main lines E and e, and passes through the binding-post'lI in the'ordinarymanner. I

Those portions of the localcircnits marked W are common to both said local circuits, as is ts L L.

M m are the binding-posts for the main lines E e. The-insulator V, while apparently altoi gether upon one side of the switch, is in reality a division of the two sides, of the points D it from the other.

The operation of myinrention may be briefly recapitulatedvas follows: v

In the dr'ewin gs, Fig. 7, the locations marked Ohicsgccnd Cincinnati represent the ends or" s telephone-line too long to be successfullyoper'ntedin a single circuit, at the ends of which are the ordinary telephones, A a. At a, central station marked Indianapolis is where each of the circuits starting from the points Chicago and Cincinnati ends, but where, by the use of my invent-ion, the electric waves or impulses sent over one circuit are repeated into or reproduced in the other, end at the ssmetirne given snhstentiall y the power originally possessed. by the originals. Uninterrupted communication may thus he held between the distant telephones A and a.

It will be understood that a second, third, or any number of these repeating-stations may be used, and thus an nninterruptcdline of any desired length may be formed,

as it insulates one Idonot claim as my invention the combination, with en. electro-megnet in one circuit,

senses I of en armature nndfinely-divided conducting material in another circuit, whereby tion, what I claim as new, and desire'to secure by Letters Patent, is.

At thejnnction of two telephonic circuits, the combination, with the two main lines thereof, of two-repeaters, two induction-coils, and twc first to the inductionccil connected with. the local circuit of the other circuit, and thence to the repeater of its own circuit, substantially as shown and specified.

In witness whereof I have hereunto set my hand and seal, at Indianapolis, Indiana, 28th day of June, A.,D.71879.

EZRA 'll. GILLILAND. [L. 8.}

in presence of- I C. BRADFORD,

Gees, B. Roonfwo'on.

v the'vari-- able magnetic ettractions are translated into 4- local circuits, each of said ma n lines running 

